SDA02H1KD Equivalent & Substitute Parts

Part Overview

The SDA02H1KD is a DIP slide switch manufactured by C&K, configured as a single-pole single-throw (SPST) switch with 2 positions. It is rated for 25mA at 24VDC and features a through-hole mounting design with PC pin termination. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Circuit Configuration	SPST
Number of Positions	2
Current Rating	25mA
Voltage Rating	24VDC
Actuator Type	Slide (Standard)
Mounting Type	Through Hole
Pitch	0.100" (2.54mm)
Height Above Board	0.228" (5.80mm)
Termination Style	PC Pin
Contact Material	Beryllium Copper
Contact Finish	Gold
Operating Temperature Range	-20°C ~ 85°C
Mechanical Life	1,000 Cycles
Electrical Life	1,000 Cycles

Substitute Part Grouping Explanation

Substitution for the SDA02H1KD is determined by strict equivalence across the following critical parameters:

Circuit Configuration: Must be SPST
Number of Positions: Must be 2
Voltage Rating: Must be 24VDC
Actuator Type: Must be Slide (Standard)
Mounting Type: Must be Through Hole
Pitch: Must be 0.100" (2.54mm)
Height Above Board: Must be 0.228" (5.80mm)
Termination Style: Must be PC Pin

The identified substitute parts meet these core mechanical and electrical requirements. Variations in current rating, body material, contact material, and compliance status are noted but do not preclude functional substitution when circuit requirements permit.

Parameter Comparison

Parameter	SDA02H1KD (Main)	SDA02H1BD (Substitute)	1825057-1 (Substitute)
Manufacturer	C&K	C&K	TE Connectivity ALCOSWITCH
Product Status	Obsolete	Active	Active
Circuit Configuration	SPST	SPST	SPST
Number of Positions	2	2	2
Current Rating	25mA	25mA	100mA
Voltage Rating	24VDC	24VDC	24VDC
Actuator Type	Slide (Standard)	Slide (Standard)	Slide (Standard)
Mounting Type	Through Hole	Through Hole	Through Hole
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Height Above Board	0.228" (5.80mm)	0.228" (5.80mm)	0.228" (5.80mm)
Termination Style	PC Pin	PC Pin	PC Pin
Contact Material	Beryllium Copper	Beryllium Copper	Copper Alloy
Contact Finish	Gold	Gold	Gold
Body Material	Polyphthalamide (PPA)	Polyphenylene Sulfide (PPS)	Polyphenylene Sulfide (PPS)
Operating Temperature Range	-20°C ~ 85°C	-40°C ~ 85°C	-30°C ~ 85°C
Mechanical Life	1,000 Cycles	1,000 Cycles	1,000 Cycles
Electrical Life	1,000 Cycles	1,000 Cycles	1,000 Cycles
RoHS Status	RoHS Non-Compliant	ROHS3 Compliant	ROHS3 Compliant
Washable	No	No	Yes

Engineering Selection Recommendations

SDA02H1BD is the primary substitute for the obsolete SDA02H1KD. Both parts are manufactured by C&K and share identical electrical ratings (25mA, 24VDC) and mechanical dimensions. The SDA02H1BD is currently in active production status with ROHS3 compliance, addressing regulatory requirements not met by the original part. The extended operating temperature range (-40°C to 85°C versus -20°C to 85°C) provides additional thermal margin. Body material differs (PPS versus PPA), but both materials are suitable for standard through-hole PCB applications.

1825057-1 is a secondary substitute manufactured by TE Connectivity ALCOSWITCH. This part maintains identical mechanical compatibility and voltage rating but features a higher current rating (100mA versus 25mA). The 1825057-1 is suitable for applications where the original 25mA rating is insufficient or where design margin is required. This part includes washable capability and ROHS3 compliance. The copper alloy contact material differs from the beryllium copper used in the original part.

Selection between SDA02H1BD and 1825057-1 depends on current requirements and design specifications. For direct replacement in existing designs rated at 25mA, SDA02H1BD is the preferred choice. For new designs or applications requiring higher current capacity, 1825057-1 provides additional headroom.

Frequently Asked Questions (FAQ)

Q: Can SDA02H1BD be used as a direct replacement for SDA02H1KD?

A: Yes. Both parts share identical electrical ratings (25mA, 24VDC), circuit configuration (SPST, 2 positions), and mechanical dimensions (pitch, height, termination style). The SDA02H1BD is actively manufactured and RoHS3 compliant, making it suitable for direct substitution in existing applications.

Q: What is the difference between SDA02H1BD and 1825057-1?

A: The primary difference is current rating: SDA02H1BD is rated for 25mA, while 1825057-1 is rated for 100mA. Both maintain the same voltage rating (24VDC), mechanical dimensions, and through-hole mounting configuration. The 1825057-1 includes washable capability and is manufactured by TE Connectivity rather than C&K.

Q: Can 1825057-1 be used in place of SDA02H1KD?

A: Yes, provided circuit requirements permit the higher current rating. The 1825057-1 meets all mechanical and voltage compatibility requirements. The higher current rating (100mA) is backward compatible with applications designed for 25mA operation.

Q: Are there packaging differences between these parts?

A: The SDA02H1KD was packaged in standard format. Both SDA02H1BD and 1825057-1 are supplied in tube packaging, which is standard for active production components.

Q: Do these parts have different compliance certifications?

A: Yes. The SDA02H1KD is RoHS non-compliant. Both SDA02H1BD and 1825057-1 are ROHS3 compliant. All three parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the operating temperature range for each part?

A: SDA02H1KD operates from -20°C to 85°C. SDA02H1BD extends this to -40°C to 85°C. 1825057-1 operates from -30°C to 85°C. Selection should account for application-specific temperature requirements.

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